<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2012 Michael Gapczynski mtgap@owncloud.com
* Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*/

class OC_Share_Backend_Calendar implements OCP\Share_Backend_Collection {
   const FORMAT_CALENDAR = 1;

   /**
   * @brief Get the source of the item to be stored in the database
   * @param string Item
   * @param string Owner of the item
   * @return mixed|array|false Source
   *
   * Return an array if the item is file dependent, the array needs two keys: 'item' and 'file'
   * Return false if the item does not exist for the user
   *
   * The formatItems() function will translate the source returned back into the item
   */
   public function isValidSource($itemSource, $uidOwner) {
      $app_model = new PCalendarModelApp();
      $calendar = $app_model->getCalendar( $itemSource );
      if ($calendar === false || $calendar['userid'] != $uidOwner) {
         return false;
      }
      return true;
   }

   /**
   * @brief Get a unique name of the item for the specified user
   * @param string Item
   * @param string|false User the item is being shared with
   * @param array|null List of similar item names already existing as shared items
   * @return string Target name
   *
   * This function needs to verify that the user does not already have an item with this name.
   * If it does generate a new name e.g. name_#
   */
   public function generateTarget($itemSource, $shareWith, $exclude = null) {
      $calendar_model = new PCalendarModelCalendar();
      $app_model = new PCalendarModelApp();

      $calendar = $app_model->getCalendar( $itemSource );
      $user_calendars = array();
      foreach($calendar_model->allCalendars($shareWith) as $user_calendar) {
         $user_calendars[] = $user_calendar['displayname'];
      }
      $name = $calendar['userid']."'s ".$calendar['displayname'];
      $suffix = '';
      while (in_array($name.$suffix, $user_calendars)) {
         $suffix++;
      }

      return $name.$suffix;
   }

   /**
   * @brief Converts the shared item sources back into the item in the specified format
   * @param array Shared items
   * @param int Format
   * @return ?
   *
   * The items array is a 3-dimensional array with the item_source as the first key and the share id as the second key to an array with the share info.
   * The key/value pairs included in the share info depend on the function originally called:
   * If called by getItem(s)Shared: id, item_type, item, item_source, share_type, share_with, permissions, stime, file_source
   * If called by getItem(s)SharedWith: id, item_type, item, item_source, item_target, share_type, share_with, permissions, stime, file_source, file_target
   * This function allows the backend to control the output of shared items with custom formats.
   * It is only called through calls to the public getItem(s)Shared(With) functions.
   */
   public function formatItems($items, $format, $parameters = null) {
      $app_model = new PCalendarModelApp();
      $calendars = array();
      if ($format == self::FORMAT_CALENDAR) {
         foreach ($items as $item) {
            $calendar = $app_model->getCalendar($item['item_source'], false);
            if(!$calendar) {
               continue;
            }
            // TODO: really check $parameters['permissions'] == 'rw'/'r'
            if ($parameters['permissions'] == 'rw') {
               continue; // TODO
            }
            $calendar['displaynamename'] = $item['item_target'];
            $calendar['permissions'] = $item['permissions'];
            $calendar['calendarid'] = $calendar['id'];
            $calendar['owner'] = $calendar['userid'];
            $calendars[] = $calendar;
         }
      }
      return $calendars;
   }

   public function getChildren($itemSource) {
      $query = OCP\DB::prepare('SELECT `id`, `summary` FROM `*PREFIX*calendar_objects` WHERE `calendarid` = ?');
      $result = $query->execute(array($itemSource));
      $children = array();
      while ($object = $result->fetchRow()) {
         $children[] = array('source' => $object['id'], 'target' => $object['summary']);
      }
      return $children;
   }

}
